Aspadol 100mg is a brand name for tapentadol, a prescription opioid analgesic used to treat moderate to severe pain. It works by binding to mu-opioid receptors in the brain to relieve pain and inhibiting norepinephrine reuptake, which enhances its pain-relieving effects. Aspadol is available in both immediate-release (IR) and extended-release (ER) formulations. The 100mg dose of immediate-release Aspadol provides 4-6 hours of pain relief, making it suitable for short-term pain management. For chronic pain, the extended-release form is preferred because it provides sustained pain relief for up to 12 hours.